Classical mechanics bound molecular dynamics

Consider now the case of bound molecular dynamics wherein classical mechanics is often tacitly assumed valid. If the rate of spontaneous emission... 

It is clear, from the discussion thus far, that typical molecular Hamiltonians display features characteristic of chaotic classical motion. The logical order followed previously, that is, the introduction of well-defined concepts of chaotic behavior in classical ideal systems, followed by an examination of realistic molecular models, does not follow through to quantum mechanics. The primary difficulty is that quantum mechanics always predicts, for bound-state dynamics, quasiperiodic motion. Several aspects of quantum chaos are discussed in Section IV. We note at this point, however, that this quantum-... 

We discuss the application of classical mechanics to van der Waals molecules and their reactions, with particular emphasis on the vibrational predissociation of XBC systems, where X is weakly bound to a molecular fragment BC. The role of nonlinear phenomena in influencing the classical reaction dynamics is stressed, as is the need to discover quantum and experimental consequences of such behaviour. 

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